<?php

/**
 * @package dompdf
 * @link    http://www.dompdf.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: php_evaluator.cls.php 448 2011-11-13 13:00:03Z fabien.menager $
 */

/**
 * Executes inline PHP code during the rendering process
 *
 * @access private
 * @package dompdf
 */
class PHP_Evaluator {

    /**
     * @var Canvas
     */
    protected $_canvas;

    function __construct(Canvas $canvas) {
        $this->_canvas = $canvas;
    }

    function evaluate($code, $vars = array()) {
        if (!DOMPDF_ENABLE_PHP)
            return;

        // Set up some variables for the inline code
        $pdf = $this->_canvas;
        $PAGE_NUM = $pdf->get_page_number();
        $PAGE_COUNT = $pdf->get_page_count();

        // Override those variables if passed in
        foreach ($vars as $k => $v) {
            $$k = $v;
        }

        //$code = html_entity_decode($code); // @todo uncomment this when tested
        eval(utf8_decode($code));
    }

    function render($frame) {
        $this->evaluate($frame->get_node()->nodeValue);
    }

}
